about 16 to 20 if I wore the right clothes, otherwise I could just be gaining weight in other's eyes... 23 is when people stopped being weird and would be more confident in congratulating. if it's your first, it takes longer cause your muscles aren't stretched from before. :) be patient and enjoy every moment, take at least weekly bump pictures too!!!!
To me, it was noticeable at 20 weeks, but strangers didn't start pointing it out until about 26 weeks!
I had last 100 before getting prego n have extra skin I'm 21 weeks n not showing yet